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A steel tube mill refers to the complete set of machinery that performs the end-to-end process of manufacturing welded steel tubes. Shijiazhuang Faith Machinery Co., Ltd. designs these mills as cohesive systems, where the focus is on the seamless transition of material from one stage to the next, from raw coil to cut-to-length tube.
The workflow in a steel tube mill is a continuous and automated sequence. It starts at the decoiler, which holds the steel coil. An entry loop pit or accumulator can be incorporated to allow for continuous operation during coil changes. The strip then feeds into a leveling machine that uses a series of small-diameter work rolls to flatten it, ensuring a uniform starting point for the forming process.
The forming section is where the geometric transformation occurs. The strip passes through multiple forming stands, often categorized into breakdown, fin, and closing passes. Each set of rolls bends the strip slightly more than the previous one, gradually forming it into a circular cross-section with the edges meeting at the top. The mechanical alignment and rigidity of this section are paramount for producing a straight and symmetrical tube.
Welding is the critical operation that permanently joins the tube. In a high-frequency ERW mill, the welding station includes the oscillator, the impedance matching system, and the pressure rolls. The quality of the weld is monitored in real-time, and parameters can be adjusted from the main control console to maintain consistency.
After welding, the tube enters the finishing line. This includes hot scarfing to remove weld flash, controlled cooling to manage material properties, and a multi-stand sizing section to bring the tube to its final dimensions. A flying cutoff saw then sections the continuous tube. Modern mills may also integrate inline testing equipment, such as ultrasonic testers, and automatic bundling systems for the finished tubes.
Shijiazhuang Faith Machinery's steel tube mills are applied in the production of tubes for a wide array of uses, from domestic water pipes to industrial structural components. The comprehensive design of the mill ensures that each stage—from material preparation and forming to welding and final sizing—is optimized for control over the product's dimensional accuracy and mechanical characteristics.
